﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

/**
 * 可选参数
 */
namespace P18_11 {
    internal class Program {
        static void Main(string[] args) {
            testDemo("张三",20);
            testDemo();
            Console.ReadLine();
        }

        static void testDemo(string name = "zhangsan", int age = 10) { 
            Console.WriteLine(name+" ==== "+age);
        }
    }

}
